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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51bd803bdcf59cebe035998af15a8dcfd58fa3f5fd502a8c594359439a4d379' 
  AND token = '/qhyx9y40txGjx5Zizqb7tNQLVCi9lcJObOaW9AHqGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}